Fly-tipping is a British

British English

British English, or English , is the broad term used to distinguish the forms of the English language used in the United Kingdom from forms used elsewhere...

 term for dumping waste

Waste

Waste is unwanted or useless materials. In biology, waste is any of the many unwanted substances or toxins that are expelled from living organisms, metabolic waste; such as urea, sweat or feces. Litter is waste which has been disposed of improperly...

 illegally instead of in an authorised rubbish dump

Landfill

A landfill site , is a site for the disposal of waste materials by burial and is the oldest form of waste treatment...

. It is the illegal deposit of any waste

Waste

Waste is unwanted or useless materials. In biology, waste is any of the many unwanted substances or toxins that are expelled from living organisms, metabolic waste; such as urea, sweat or feces. Litter is waste which has been disposed of improperly...

onto land, i.e. waste dumped or tipped on a site with no licence to accept waste.

The term is derived from the verb tip, meaning "to throw out of a vehicle" and on the fly, meaning "on the wing" — to throw away carelessly or casually.